Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
  1. GRB 071028: Swift detection of a burst
  2. GRB 071025: Kuiper Telescope Optical Observations
  3. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  4. GRB 071018: Revised BAT position
  5. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  6. GRB071021: MARGE Optical Limits
  7. GRB071020, optical upper limit
  8. GRB 071025: SARA VRI upper limits
  9. GRB 071025 Milagro GeV/TeV Observations
  10. GRB 071025: SQIID JHK photometry
  11. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  12. GRB071025: Optical Pre-imaging from Palomar
  13. Swift UVOT upper limits
  14. GRB071025: Xinglong TNT I-band upper limit
  15. GRB 071025: Swift-XRT Team refined analysis
  16. GRB 060602A: host redshift
  17. GRB 071025, Swift-BAT refined analysis
  18. GRB 071025: Early Super-LOTIS Observations
  19. GRB 071025: R/I-band update
  20. GRB071021 : CFHT Ks-band observation
  21. GRB 071025: ROTSE-III Refined Analysis
  22. GRB 071025: I-detection, R-dropout?
  23. GRB 071025: Swift XRT refined position
  24. GRB 071025a: PAIRITEL observations
  25. GRB071025: REM NIR afterglow
  26. GRB 071025: ROTSE-III Detection of Optical Counterpart
  27. GRB 071025: Swift detection of a burst
  28. GRB 071021: R-band detection and analysis
  29. GRB 071020: BTA spectroscopy
  30. GRB071021: Optical+NIR observations
  31. Possible radio detection of GRB 071021 with the VLA
  32. Optical observations of GRB 071020
  33. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  34. GRB 071020: SARA observations
  35. Radio detection of GRB 071020 with the VLA
  36. GRB071010b: optical observation
  37. GRB 071021: Subaru NIR observation
  38. GRB071021: MITSuME Okayama Optical Upper Limits
  39. GRB 071021: Magellan i-band observation
  40. GRB 071021: Magellan R-band observation
  41. GRB 071021: Z-band detection
  42. GRB 071021: correction to GCNC 6968
  43. GRB 071020: Fading slowly?
  44. GRB 071010B: Fading quickly
  45. GRB 071021: optical and NIR observations
  46. GRB 071021: possible high-z burst
  47. GRB 071021, Swift-BAT refined analysis
  48. GRB071018: 2nd epoch obsevations of Xinglong TNT
  49. GRB 071021: retraction of Faulkes Telescope South candidate
  50. GRB 071021: Swift-XRT Team refined analysis
  51. GRB 071021: Xinglong TNT optical Upper Limit
  52. GRB 071021 : Lulin R-band limit
  53. Konus-Wind observation of GRB 071020
  54. GRB 071021: Faulkes Telescope South optical candidate
  55. GRB 071021: Swift detection of a burst
  56. GRB 071010B: Independent Confirmation of Break
  57. GRB071020A: Xinglong TNT Optical afterglow observations
  58. GRB 071020: Swift-XRT refined analysis
  59. GRB 071020, Swift-BAT refined analysis
  60. GRB 071020A: IR Imaging with PAIRITEL
  61. GRB 071020: VLT spectroscopy
  62. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  63. GRB071020 - SDSS Pre-burst Observations
  64. GRB 071020: Swift detection of a bright burst
  65. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  66. GRB 071018: Mercator Telescope optical observations
  67. Swift autonomous slewing re-enabled
  68. GRB071010b: optical observations
  69. GRB 071018: SARA observations
  70. GRB 071018: Swift-XRT observation
  71. GRB 071017 - Swift XRT observations
  72. VLA radio observation of GRB 071018
  73. GRB071018: Correction to the GCN 6936
  74. GRB071018: Correction to the GCN 6936
  75. GRB071018: Correction to the GCN 6936
  76. GRB071018: Correction to the title of the GCN 6936
  77. GRB 071018: Possible OT from Xinglong TNT observation
  78. GRB 071010B: Light Curve Break Confirmed
  79. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  80. GRB 071018, Swift-BAT refined analysis
  81. GRB 071018?: Swift detection of a possible burst
  82. GRB 071010B: Suzaku WAM observation of the prompt emission
  83. GRB 071013: 3rd TLS Epoch - constraints on variability
  84. GRB 071013: TNT optical data refined analysis
  85. GRB 071010B: Keck/DEIMOS emission-line redshift
  86. GRB 071017: a SHORT GRB detected by INTEGRAL
  87. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  88. GRB071013: optical observations
  89. GRB 071010B: Optical observations of EST
  90. GRB 071010B: TLS 3rd Epoch - finally a break??
  91. GRB 071011: MITSuME Optical Observations
  92. GRB 070920A: deep optical observations at the NOT
  93. GRB 071010B: Photometry after 1.6 days
  94. GRB 071010B: Keck/LRIS Photometry
  95. GRB 071010B: TLS 2nd Epoch, refined analysis
  96. GRB 071013: TLS Upper Limit
  97. Correction to GCN circular no. # 6915 for GRB 071010B
  98. VLA detection of radio afterglow of GRB 071010B
  99. VLA non-detection of GRB 071011
  100. GRB 071013: Optical observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov